Opening the cover | Lenovo TC A51-8428, TC A51-8425, TC A51-8424

Opening the cover

Important

Read “Important safety information” on page v and “Handling static-sensitive devices” on page 9 before opening the cover.

To open the cover:

1.Shut down your operating system, remove any media (diskettes, CDs, or tapes) from the drives, and turn off all attached devices and the computer.

2.Unplug all power cords from electrical outlets.

3.Disconnect all cables attached to the computer. This includes power cords, input/output (I/O) cables, and any other cables that are connected to the computer.

4.Remove the floor stand, if attached.

5.If a cover lock is installed, unlock the cover.

6.Press inward on the two buttons and rotate the top cover upward as illustrated.

12User Guide

Image 26

Lenovo TC A51-8428, TC A51-8425, TC A51-8424, TC S51-8171, TC S51-8173, TC S51-8172 manual Opening the cover

Contents

User Guide Types 8424, 8425 Types 8171, 8172 Page User Guide Types 8424, 8425 Types 8171, 8172 Page Contents Iv User Guide Important safety information Conditions that require immediate action Power cords and power adapters General safety guidelinesService Batteries Extension cords and related devicesPlugs and outlets Heat and product ventilation CD and DVD drive safetyAdditional safety information To connect To disconnect Connexion Déconnexion Lithium battery noticeModem safety information Laser compliance statement Consignes de sécurité relatives au modem Xii User Guide Overview Information resources Features Security features Input/output featuresPower Expansion IBM preinstalled software Operating systems preinstalled varies by model Available options Specifications Supported operating positions User Guide Handling static-sensitive devices Installing optionsInstalling external options Cover keylock some models Locating connectors on the rear of your computer Obtaining device drivers Opening the cover Locating components Accessing system board components and drives Identifying parts on the system board Installing memory Installing PCI adapters Removing and replacing the battery What to do next Removing and replacing an optical drive Installing security features Removing and replacing a diskette drive Identifying security locks Integrated security cable User Guide Rope clip Password protectionTo install a rope clip Cover lock Erasing a lost or forgotten password clearing Cmos Closing the cover and connecting the cables Viewing and changing settings Using the IBM Setup UtilityStarting the IBM Setup Utility program Exiting from the IBM Setup Utility program Administrator Password Password considerationsUser Password IDE Drive User Password Using Security Profile by Device IDE Drive Master PasswordSetting, changing, and deleting a password Select Security Profile by Device Selecting a temporary startup device Advanced settingsSelecting a startup device Changing the startup device sequence Updating flashing Bios from your operating system Appendix A. Updating POST/BIOSUpdating flashing Bios from a diskette Recovering from a POST/BIOS update failure Cleaning a mouse with a ball Appendix B. Cleaning the mouseCleaning an optical mouse User Guide Appendix C. Manual modem commands Basic AT commands Set Tone Dial as default Low speaker volumeSet Pulse dial as default Internal speaker on until carrier detected Extended AT commands MNP/V.42/V.42bis/V.44 commands Fax Class 1 commands Fax Class 2 commands Voice commands Appendix C. Manual modem commands User Guide Appendix D. Notices Trademarks IBM Index Special characters Page Page Part Number 19R0474